CN101253046A - Apparatus and methods for making crosslinked elastic laminates - Google Patents

Apparatus and methods for making crosslinked elastic laminates Download PDF

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Publication number
CN101253046A
CN101253046A CNA200680031741XA CN200680031741A CN101253046A CN 101253046 A CN101253046 A CN 101253046A CN A200680031741X A CNA200680031741X A CN A200680031741XA CN 200680031741 A CN200680031741 A CN 200680031741A CN 101253046 A CN101253046 A CN 101253046A
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China
Prior art keywords
elastic layer
elastic
machining cell
crosslinkable
roller
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CNA200680031741XA
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Chinese (zh)
Inventor
J·R·小费茨
C·A·拉斯利
O·P·托马斯
H·M·维尔奇
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Kimberly Clark Worldwide Inc
Kimberly Clark Corp
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Kimberly Clark Worldwide Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
    • B32B2310/0831—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0875—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation
    • B32B2310/0887—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • B32B37/203—One or more of the layers being plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/18—Handling of layers or the laminate
    • B32B38/1858—Handling of layers or the laminate using vacuum

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

An apparatus for making an elastic laminate including a crosslinked elastic layer formed of an elastic copolymer includes a die for extruding a layer of crosslinkable elastic copolymer, at least one roll for conveying the elastic layer, a supply source for providing at least one nonwoven web, a lamination nip for laminating at least one nonwoven web to the elastic layer, a processing unit for crosslinking the elastic layer and a winder for collecting the elastic laminate. The crosslinkable elastic copolymer may be a crosslinkable elastic styrenic block copolymer, a crosslinkable semi-crystalline polyolefin plastomer, or a crosslinkable propylene-ethylene copolymer. The crosslinkable elastic layer may be extruded in the form of a plurality of parallel filaments such as by a filament die. The processing unit may be positioned between the at least one roll and the lamination nip or may be positioned between the lamination nip and the winder. The processing unit may have an open or a closed configuration and may be an electron beam processing unit.

Description

Make the apparatus and method of crosslinked elastic laminates
Background of invention
Be bonded on one or more layers nonwoven facings by the elastomeric polymer layer that will be film, foam, nonwoven web or parallel tow shape, can form elastic composite miscellaneous." laminated material of stretch-bonded " (" stretch bonded laminate " " SBL ") is any laminated material that is bonded to when elastic layer is being stretched on one or more layers nonwoven facings.When elastic layer takes place to relax subsequently, on surface layer, form fold.The laminated material of stretch-bonded is for example at the United States Patent (USP) 6,387,471 of authorizing Taylor etc., and authorizes in the United States Patent (USP) 6,323,389 of Thomas etc. and be described, and these two pieces of patents are incorporated into through quoting at this." laminated material of neck-bonded " (" neck-bonded laminate " (" NBL ")) is any when elastic layer is bonded on one deck or the two-layer non-resilient surface layer, elastic layer take place lax and surface layer takes place to extend or constriction to reduce their laminated materials in the size of extension vertical direction.The laminated material of neck-bonded has crisscross stretching and restores performance.The laminated material of neck-bonded is for example at the United States Patent (USP) 5,853,881 of authorizing Estey etc., authorize the United States Patent (USP) 4 of Morman etc., 965,122, authorize the United States Patent (USP) 6 of Morman etc., 001,460, and the United States Patent (USP) 5,789 of authorizing Haffher etc., be described in 065, these several pieces of patents are incorporated into through quoting at this." laminated material of neck-stretch bonded " (" neck-stretch bonded laminate " (" NSBL ")) is any when elastic layer is bonded on one deck or the two-layer surface layer, and elastic layer take place to stretch and surface layer takes place to stretch and causes laminated material in extension vertical direction constriction at equidirectional.Therefore, NSBL has had the feature of SBL and NBL concurrently.
" vertical filament laminate " (" vertical filament laminate " (" VFL ")) or " laminated material of vertical filament stretch bonded " (" vertical filament stretch bonded laminate (" VFSBL ")) be any when the elastic layer substantially parallel, achiasmate elastic strands that is formed by elastomeric material is bonded on one deck or the two-layer surface layer, elastic strands is in extended state and surface layer is in the laminated material of unstretched condition.When laminated material takes place to relax, the elastic strands withdrawal, thus laminated material presents to a certain degree gauffer and ripple.VFL also is that vertical (machine direction) of non-resilient surface layer shows elastic stretching at the length direction of elastic strands." laminated material of continuous monofilament stretch-bonded " (" continuous filament stretch bondedlaminate " (" CFSBL ")) is when any elastic layer that forms in the substantially parallel achiasmate elastic strands that is covered by the covering array of at least a traditional meltblown fibers is bonded on one deck or the two-layer surface layer, the laminated material that elastic layer vertically is being stretched.Parallel elastic strands and traditional meltblown fibers form by elastomeric material.When allowing CFSBL to be retracted to relaxed state, on surface layer, form some folds (gathering).Lax CFSBL can vertically being stretched at laminated material.The laminated material of continuous monofilament stretch-bonded for example has exposure in the United States Patent (USP) 5,385,775 of authorizing Wright.
Known various thermoplastic elastomer (TPE) is used for elastic layer, and they include but not limited to styrene block copolymer.For example, authorize the United States Patent (USP) 6 of Thomas etc., 323,389 have disclosed and have used the block copolymer with general formula A-B-A ' or A-B, wherein A and the A ' thermoplastic polymer end-blocks of respectively doing for oneself contains the polystyrene part, for example polyvinyl aromatic hydrocarbons, B is the elastomeric polymer mid-block, for example conjugated diene or lower alkene polymers.A can be made of identical or different polymer segments with A ' block.Also disclose the Tetrablock copolymer with formula A-B-A-B, wherein A is a thermoplastic polymer block as described above, and each B is an isoprene segment, and it has carried out the hydrogenation of certain degree and has become poly-(ethylene-propylene) segment.
Elastic laminate material is personal-care supplies such as diaper normally, diaper pants, adult-incontinence clothing, the most expensive part in the feminine hygiene articles etc.The key property of elastic laminate material comprises under the extension of various degree in use provides enough elasticity tensions, and provides enough recoveries when stress relaxation (creep resistance).
Further need under lower cost, to make better the apparatus and method of elastic laminate material.
Summary of the invention
The present invention relates to a kind of device of making elastic laminate material, comprising: mould is used to extrude the layer that is formed by crosslinkable elastocopolymer such as elastic phenylethylene based block copolymer, at least one roller, be used to transmit the elastic layer of extruding, the feed source is used to provide at least one nonwoven web, lamination nip (nip), be used at least one nonwoven web is laminated to elastic layer, machining cell is used for the cross-linking elasticity layer, and a reel, be used to collect elastic laminate material.Crosslinkable elastocopolymer can be with polymer thin film, foam, and nonwoven web, the form of elastic ribbon or elastic strands layer is extruded.Extrusion die can be the filament die that is used to extrude a plurality of parallel crosslinkable elastomeric monofilaments, film die, and foam mold, or be used to extrude the silk ribbon mould of a plurality of crosslinkable elastic ribbons.Machining cell can apply electron beam to elastic layer, and it is crosslinked that elastocopolymer takes place for ultraviolet ray (UV) or γ radiation.A kind of suitable machining cell can be the electron beam machining cell with open and closed construction.Machining cell can be between roller and lamination nip.Perhaps, machining cell also can place after the lamination nip.This device can further comprise meltblown die, and it places fibre web to form on the device, is used to spray the random arrangement of elastomer to cover the elastic layer of extruding.
The invention still further relates to a kind of method of making elastic laminate material.This method may further comprise the steps: extrude crosslinkable elastocopolymer such as styrene block copolymer, the temperature of the elastic layer that adjusting is extruded, at least one nonwoven web is provided, should be laminated on the elastic layer by at least one nonwoven web, and the cross-linking elasticity layer.Elastic layer can carry out crosslinked before or after being laminated at least one the nonwoven web.
The crosslinked elastic performance that has improved it of elastocopolymer.When uncrosslinked elastocopolymer is low performance elastomers, the crosslinked high performance elastomer elastomer of superior performance (or be converted at least) that is translated into.When uncrosslinked elastocopolymer is high performance elastomer, crosslinkedly be translated into more high performance elastomer.
The present invention can use the elastomer of relatively cheap lower-performance as initiation material.For ease of processing, elastic layer is to form under the condition that can not make polymeric material generation significant cross linking.After having formed elastic layer, by crosslinked its elastic performance that improves.
Describedly find out that by top the features and advantages of the present invention have provided uses relatively low performance (and more cheap) elastic polymer material to produce the apparatus and method of the elastic laminate material with relative superior performance.
Further feature and advantage of the present invention have provided the apparatus and method of the manufacturing elastic laminate material that can be easy to integrate with existing equipment.
Description of drawings
Fig. 1 shows the device that is used to make vertical filament laminate, and the machining cell that wherein is used for the cross-linking elasticity copolymer places between roller and the lamination nip.
The device that Fig. 2 shows among Fig. 1 further comprises a control folder, and it places between machining cell and the lamination nip.
Fig. 3 shows the device that is used to make vertical filament laminate, and the open machining cell that wherein is used for the cross-linking elasticity copolymer is positioned at the outer surface of close first roller.
The device that Fig. 4 shows among Fig. 3 further comprises the second open machining cell, and it is positioned at the outer surface near second roller.
Fig. 5 shows when second roller and is removed and device among Fig. 1 when the crosslinked machining cell of elastocopolymer is replaced.
Fig. 6 shows the device that is used to make vertical filament laminate, and the machining cell that wherein is used for the cross-linking elasticity copolymer places after the lamination nip.
Fig. 7 shows the device of the laminated material that is used to make the continuous monofilament stretch-bonded, and the machining cell that wherein is used for the cross-linking elasticity copolymer is positioned near fibre web and forms the device place.
Fig. 8 shows the device of the laminated material of the vertical filament-continuous monofilament stretch-bonded that is used to make mixing, and the open machining cell that wherein is used for the cross-linking elasticity copolymer forms between the device at roller and fibre web.
Fig. 9 shows the device of the laminated material of the vertical filament-continuous monofilament stretch-bonded that is used to make mixing, and the sealing machining cell that wherein is used for the cross-linking elasticity copolymer forms between device and the lamination nip at fibre web.
Definition
" flexible " and " elastomeric " be meant applied guiding force (biasing force) thus after can produce guiding length that at least 50% stretching reaches stretching at least than its lax unstretched length long 50%, and after having eliminated stretching, guiding force, will restore fiber, film or the fabric of at least 50% extension.
" recovery " be meant to material apply guiding force and produce when removing guiding force after it produce to be stretched lax.For example, if by stretching make have lax non-guiding length be 1 inch its length of material extending 50%, become 1.5 inches, then this material will have the tensile elongation than its relaxed length long 50%.If the material of the stretching of above-mentioned example shrinks, promptly after eliminating guiding and tensile force, reset into 1.1 inches, then this material has restored 90% (0.4 inch) of development length with respect to its length that do not lead.
" high performance elastomer " is meant those when forming film, the elastomer of the withdrawal force loss in the time of can extending to the length of stretching when tow or similar articles and can not experience significantly in medium (lower) tensile elongation when withdrawal.These elastomers have some useful properties usually, as high strength, and low hysteresis, low creep, the permanent deformation of low ratio and low stress relaxation.The hysteresis that high performance elastomer has is 25% or lower, more preferably 20% or lower, and these numerical value are determined according to sluggish method of testing described herein.
" low performance elastomers " is meant those when forming film, can extend to the length of stretching when tow or similar articles but the elastomer of withdrawal force can significantly lose them in medium (lower) tensile elongation when withdrawal the time.These elastomers demonstrate hysteresis, creep and the stress relaxation of higher level usually when stretching.The hysteresis that low performance elastomers has is greater than 25%, and more preferably 40% or higher, these numerical value are determined according to sluggish method of testing described herein.
" polymer " comprises homopolymers, copolymer, block for example, grafting, random and alternate copolymer, terpolymer etc., and their blend and modifier.Term " polymer " " also comprise all possible geometric configuration of molecule.These configurations include but not limited to the upright structure of full rule, and are syndiotactic and atactic symmetries.
" block copolymer " is the polymer that comprises separately in the polymer that the dissimilar polymer segment of one section similar monomeric unit links together by covalent bond.For example, comprising the styrene units of one section repetition in the SBS block copolymer, next is the butadiene unit of one section repetition, next is the styrene units of one section repetition again.
" blend " is meant the mixture of two or more polymer and/or additive.
" supatex fabric or fibre web " is meant the single-stranded fiber with sandwich or the fibre web of silk thread, but obviously different with form knitting or woven fabric.Supatex fabric or fibre web can form by many methods, meltblown for example, spun-bond process, and the carded web processes of bonding.The basis weight of supatex fabric is usually with the expression of the gram number (gsm) of the material of ounce number (osy) or every square metre of every square yard of material, and available fibre diameter is expressed with micron usually.(noticing that the conversion from osy to gsm is that osy be multiply by 33.91).
" spun-bonded fibre " is meant that this spinning head has the diameter of extruded monofilament and dwindles rapidly by extrude the less fiber of diameter that molten thermoplastic material forms from a plurality of tiny spinning heads that are generally the circular capillaries shape, for example referring to the United States Patent (USP) 4 of authorizing Appel etc., 340,563, authorize the United States Patent (USP) 3 of Dorschner etc., 692,618, authorize the United States Patent (USP) 3,802 of Matsuki etc., 817, authorize the United States Patent (USP) 3,338,992 and 3 of Kinney, 341,394, authorize the United States Patent (USP) 3,502 of Hartman, 763, and the United States Patent (USP) 3,542,615 of authorizing Dobo etc.Spun-bonded fibre is not clamminess when collecting on the surface usually being deposited on.Spun-bonded fibre is generally continuous and has average diameter (obtaining from lacking 10 samples certainly) greater than 7 microns, more particularly between about 10～20 microns.
" meltblown fibers " is meant by a plurality of tiny and be generally circular die capillaries, silk thread or the monofilament of molten thermoplastic material as fusion is expressed in gas (for example air) stream that has gathered normally heat at a high speed, makes the molten thermoplastic monofilament subtract the fiber that carefully forms to reaching the microfibre diameter with the diameter that reduces them.Then, meltblown fibers is carried and is deposited on the collection surface and goes up the meltblown fiber web that forms random distribution by high velocity air.This process for example is described in the United States Patent (USP) 3,849,241 of Butin etc.Meltblown fibers is continuous or discontinuous microfibre, and average diameter is generally less than 10 microns, is clamminess in the time of generally on depositing to the collection surface.
" silk ribbon " or " element of ribbon-shaped " is meant to have the thermoplastic polymer monofilament that the definition flatness ratio is at least 2 cross sectional dimensions, the element of diaphragm or other elongation." flatness ratio " is defined as the ratio of the longest cross sectional dimensions and short cross-sectional size.For example, the element of ribbon-shaped can have rectangle, ellipse, or the cross section of dumb-bell shape.
" open structure " or " open machining cell " is meant the system in lead/steel shielding of not exclusively being closed in as electron beam or e-bundle unit.Open machining cell can comprise to small part and is looped around arc radiation shield around the adjacent roll.Roller plays the effect of electron collector, is discharged into radiation in the surrounding environment with minimizing.
" structure of sealing " or " machining cell of sealing " is meant the system in the lead/steel screen with entrance and exit of being closed in as electron beam or e-bundle unit.
" personal care product " is meant diaper, paper diaper, absorbent underpants, adult incontinence products, and feminine hygiene articles.
The specific embodiment
What the present invention relates to is the device of making the elastic laminate material that comprises the cross-linking elasticity layer, wherein elastic layer can comprise styrenic block copolymer elastomer, olefin elastomer such as hemicrystalline polyolefin plastomers or propylene-ethylene copolymers, and/or other elastomeric material.Term " cross-linking elasticity layer " comprise any in this layer to the small part elastomer be crosslinked, and the crosslinked such layer of elastic layer after forming that occur in.
Referring to Fig. 1, device 10 comprises mould 12, is used to extrude the layer that contains crosslinked elastocopolymer 14, at least one roller 16, be used to transmit the elastic layer of extruding 14, feed source 18 is used to provide at least one nonwoven web 20, lamination nip 22, be used at least one nonwoven web 20 is laminated to elastic layer 14, machining cell 26 is used for cross-linking elasticity layer 14, and reel 28, be used to collect elastic laminate material 30.
Mould 12 through setting and with crosslinkable elastocopolymer with film, froth bed, tow or fiber array (as substantially parallel tow or fiber), the silk ribbon array, nonwoven web (as spunbond fibre web, melt spray fibre web, or other nonwoven web) or above-mentioned combining form are extruded.Compatibly, mould can be the filament die that is used to extrude a plurality of substantially parallel achiasmate crosslinkable elastomeric monofilaments.Perhaps, mould also can be the silk ribbon mould that is used to extrude the elastomer element of a plurality of crosslinkable ribbon-shaped, and these elastomer elements for example are the United States Patent (USP)s 6,057 at total Mleziva etc., those that disclose in 024, this patent is incorporated into through quoting at this.
The crosslinkable elastocopolymer that is fit to is that crosslinked thermoplastic elastomer (TPE) does not also take place for those.Before extruding, carry out crosslinked may the mobile performance of material being had a negative impact, thereby make copolymer be not suitable for extruding.
Crosslinkable elastocopolymer can comprise crosslinkable styrene block copolymer.The styrenic block copolymer elastomer that is fit to comprises styrene-diene and styrene-olefin block copolymers.Styrene-diene block copolymer includes but not limited to diblock, three blocks, four blocks or other block copolymer, and also can comprise styrene-isoprene, styrene-butadiene, styrene-isoprene-phenylethene, s-B-S, styrene-isoprene-phenylethene-isoprene, and s-B-S-butadiene block copolymer.Styrene-the diene polymer (for example s-B-S triblock copolymer) that comprises butadiene is particularly suitable.A kind of can the commercial SBS that obtains be VECTOR 8508, can obtain from Dexco Polymers L.P.The example of styrene-isoprene-styrene copolymer-comprises VECTOR 4111A and 4211A, and they can obtain from DexcoPolymers L.P.
Styrene-olefin block polymers includes but not limited to styrene-diene block copolymer, diene group is wherein completely or partially selected hydrogenation, they include but not limited to styrene-(ethylene-propylene), styrene-(ethene-butylene), styrene-(ethylene-propylene)-styrene, styrene-(ethene-butylene)-styrene, styrene-(ethylene-propylene)-styrene-(ethylene-propylene), and styrene-(ethene-butylene)-styrene-(ethene-butylene) block copolymer.In the superincumbent structural formula, the block sequence of term " styrene " expression styrene repetitive; Term " isoprene " and " butadiene " are meant the block sequence of diene units; The block sequence of term " (ethylene-propylene) " expression ethylene-propylene copolymer unit, and the block sequence of term " (ethene-butylene) " expression ethylene-butene copolymer unit.The cinnamic weight content that styrene-diene or styrene-olefin block copolymers have should be about 10～about 50%, fit value is about 15%～about 25%, and should have weight average molecular weight about 15 at least, 000g/mol, fit value are about 30,000～about 120,000g/mol, or about 50,000～80,000g/mol.Styrene-diene block copolymer carries out in the back crosslinked in owing to have extra degree of unsaturation outstanding tool advantage.
Other crosslinkable styrene block copolymer that is fit to comprises styrene-diene block copolymer and styrene-olefin block copolymers, for example those above-described copolymers with different saturated levels.
Thereby the molecular weight of styrene block copolymer should enough low styrene block copolymer or polymeric blends can form elastic layer, and can in forming process, not cause crosslinked significantly.Styrene block copolymer or polymeric blends should be adapted at below 220 ℃, especially at about 210 ℃, or process under about 125-200 ℃.Will be for reaching the required molecular weight ranges of this purpose according to the type of styrene block copolymer, the content of supplementary element and type, and the character of formed elastic layer and determining.
Elastic layer can comprise at least about 25% weight, or at least about 40% weight, or at least about 50 weight, or at least about the styrenic block copolymer elastomer of 75% weight.Elastic layer can contain the most nearly 100% weight, or up to about 99.5% weight, or up to about 95% weight, or up to about 90% weight, or up to about 80% weight, or up to about the styrenic block copolymer elastomer of 70% weight.Styrenic block copolymer elastomer can comprise the mixture of a kind of styrenic block copolymer elastomer or multiple styrenic block copolymer elastomer.
Selectively or additionally, crosslinkable elastocopolymer can comprise crosslinkable olefin elastomer.The crosslinkable olefin elastomer that is fit to comprises hemicrystalline polyolefin plastomers, and it can be the product that is called VISTAMAXX by the commodity that Exxon-Mobil Chemical Co obtains.Other crosslinkable olefin elastomer that is fit to comprises propylene-ethylene copolymers, and it can be the product that is called VERSIFY by the commodity that DowChemical Co obtains.
Optional supplementary element can constitute the remainder in the elastic layer.These components include but not limited to the ethylene-alpha-olefin copolymer elastomer of single-site catalyzed, and its density is less than about 0.915g/cm 3, especially about 0.860-0.900g/cm 3, or about 0.865-0.895g/cm 3These ethylene-alpha-olefin copolymers can use C 3-C 12The alhpa olefin comonomer, butylene suitably, hexene or octene form.The amount of alhpa olefin comonomer is about 5-25% of copolymer weight, 10-25% suitably, and adjust with the density of expectation.The ethylene-alpha-olefin copolymer of the single-site catalyzed that is fit to has the product of the commodity of Dow Chemical Co. produce and market AFFINITY by name and ENGAGE, the product of the commodity of ExxonMobil Chemical Co. produce and market EXACT by name and EXCEED.
Other optional member comprises the polymer of inelastic body, polyethylene for example, polypropylene and other polyolefin, and other elastomer polymer.When non-elastic polymer existed, their amount should be less relatively, thereby can not weaken the elastomer performance of crosslinked elastic layer.
Other optional member comprises assisting under enough low temperature and forms elastic layer to avoid producing significant crosslinked processing aid too early.A kind of suitable processing aid is a polyolefin-wax, for example side chain or LLDPE wax, and its density is about 0.860-0.910g/cm 3, the melt index (MI) of measuring under 190 ℃ and 2160g load according to ASTMD1238 is about 500-4000g/10min.The example of Tissuemat E comprises the EPOLENE C-10 that Eastman Chemical Co. produces, and the PETROTHANE NA601 of Quantum Chemical Co product.Other example comprises the single-site catalyzed wash-out polymer of the high-melt index (low-molecular-weight) of wax shape, the product of the commodity AFFINITY by name that produces as DowChemical Co., for example AFFINITY 1900 and 1950 polyolefin plastomers.
Other processing aid that is fit to has the hydrocarbon tackifier of the styryl of the about 500-2500 of weight average molecular weight.An example is REGALREZ 1126 tackifier that Eastman Chemical Co. produces.The another kind of processing aid that is fit to is a castor oil.Mineral oil also is the processing aid that is fit to.Processing aid can account for about 0.1-50% of elastic layer weight altogether, especially about 5-30%, or about 10-20%.When using castor oil, its content should be suitable for crosslinking coagent.
Other optional member comprises crosslinking coagent, and crosslinked additive takes place the elastic layer that promptly helps to form.One or more crosslinking coagents can account for about 0.1-10% of elastic layer weight altogether, especially about 0.5-5%.Castor oil is a kind of in this auxiliary agent.Castor oil is natural triglyceride, contains three oleic acid chains, and the degree of unsaturation that every chain has is 1.Polymerization can take place receiving under initiating accident sequence such as the electron beam irradiation effect in castor oil.Castor oil about be heat-staple below 275 ℃, and can in extruder, together process, and can not degrade with styrenic block copolymer elastomer.The gained elastic layer can be used the energy-rich radiation source, carries out polymerization (crosslinked) as electron beam.Because have three unsaturated chains on each castor oil molecule, castor oil will be by assisting to carry out 3 D cross-linked with the chain transfer reaction of macromolecular chain on every side.
Other crosslinking coagent includes but not limited to polyfunctional acrylate and allyl deriv such as diethyleneglycol dimethacrylate, acrylic acid dimethylene diol ester, the trimethyl propane diallyl, dimethacrylate methylene glycol ester, and other has the polyfunctional monomer that has enough heat endurances in melt extruding process.Other crosslinking coagent is included in polymer and the oligomer that has secondary carbon atom and unsaturated double-bond on polymer backbone or the side chain.Making elastic layer that crosslinked benefit take place includes but not limited to, a) aging behavior still less, can by elastic layer reel and be stored on the spool time seldom or do not have the loss of tension and be confirmed, b) better temperature stability, can by do not need stored frozen and the transportation elastomeric material be confirmed, and c) when elastic layer is being laminated on other layer after crosslinked and the acquisition stronger adherence.
Other optional ingredients comprises granular inorganic or organic filler.In general, filler particles has the about 0.5-8 micron of average particle size particle size, especially about 1-2 micron.The inorganic filler that is fit to comprises calcium carbonate (CaCO 3), various clays, silica (SiO 2), aluminium oxide, barium sulfate, sodium carbonate, talcum, magnesium sulfate, titanium dioxide, zeolite, aluminum sulfate, cellulose-type powders, diatomite, calcium oxide, magnesia, aluminium hydroxide etc.The organic filler that is fit to comprises cellulose, cyclodextrin, and caged molecule (for example chemical substance of cage type oligomeric silsesquioxane nanometer stretching).When using filler, filler particles can account for about 20-75% of elastic membrane weight, especially about 30-60%.
The thermal polymerization that contains diene polymer is normally finished by radical polymerization mechanism, comprising initiation, and chain growth and termination.Radical initiator such as peroxide are normally used for causing Raolical polymerizable.When heating, initiator breaks produces the two keys that contain in the attack polymer in the diene fragment, thereby produces the free radical that another continues this propagation process.In the present invention, the crosslinked radiation that can be exposed to high energy source such as electron beam of styrene block copolymer by two ethylene linkages (being butadiene or isoprene fragment) that will be arranged in styrene block copolymer rubbery state zone.After exposing to high energy source, the diene bond fission forms free radical, and it can form crosslinked molecule network structure in new direction combination again.
Elastic layer 14 can be laminated at least one the nonwoven web 20.Nonwoven web can be formed by various polymer, and these polymer can be crosslinked or noncrosslinking, and can be flexible or stiff.The stiff polymer that is fit to comprises polyolefin, as ethene, and the homopolymers of propylene and butylene, the copolymer of these monomers is comprising the alpha-olefin comonomer that is up to about 12 carbon atoms of (particularly 5%) the most nearly 10%.Stiff polymer also comprises some polyamide, polyester etc.The elastomeric polymer that is fit to comprises ethene, and the copolymer of propylene and butylene and alpha-olefin comonomer, the percentage by weight of every kind of comonomer in the copolymer are generally above 10% but be less than 90%.Elastic olefin copolymers comprises that its density that has is about 0.855-0.900g/cm as the ethene of single-site catalyzed and the copolymer of the alpha-olefin comonomer that surpasses 10% weight 3The elastomeric polymer that is used for non-woven layer that is fit to also comprises ethene-vinyl acetate, ethylene-propylene acetoacetic ester, ethylene-methyl acrylate, ethylene-propylene acid butyl ester, polyurethane, the ether-ester copolymer of block and the acid amides-ether copolymer of block.Other non-woven layer elastomeric polymer that is used for that is fit to comprises elastic olefin polymers such as hemicrystalline polyolefin plastomers, it can be the product that is called VISTAMAXX by the commodity that Exxon-Mobil Chemical Co obtains, propylene-ethylene copolymers, it can be the product that is called VERSIFY by the commodity that Dow Chemical Co obtains.
Elastic layer and nonwoven web can use various heat treatments, and adhesion process and ultrasonic processing and other are fit to the processing method of various application and combine.Also can use contact adhesive.Pressure sensitive composite can comprise that the commodity by Eastman Chemical Co. product of about 10%-about 70% are called the tackifier of REGALREZ 1126.Type of elastic layer (film, foam, nonwoven web, net or filament array) and the polymer type (flexible or stiff) that is used for nonwoven web will depend on process and final use to a great extent.
In case after elastic layer 14 forms, can make it pass through machining cell 26 and take place crosslinked.Elastic layer 14 can carry out crosslinked before being laminated on the nonwoven web shown in Fig. 1-5 and 7-9 like that, or carried out crosslinked after on being laminated to nonwoven web as shown in Figure 6.
Machining cell 26 can send or apply the radiation of electron beam or e-bundle, ultra-violet radiation, and the γ radiation, or other medium that is fit to is to elastic layer and cause the crosslinked of styrene block copolymer.Required amount of radiation will depend on linear velocity, the crosslinked amount of expectation, the emission types of use, the thickness of elastic layer and/or concrete the composition.In the present invention, elastic layer is considered to such a kind of " crosslinked elastic layer ", and promptly the percentage load loss of the percentage load loss of measuring it with the method for testing that describes below before crosslinked reduced at least 5%, or at least 10%, or at least 20%.For example, if elastic layer shows the percentage load loss of 65% before crosslinked, and if crosslinking Treatment causes the reduction of its percentage load loss to be no more than 60% (reducing 5%), or be no more than 55% (reducing 10%), or be no more than 45% (reducing 20%), then this elastic layer will be considered to crosslinked.
A kind of suitable machining cell 26 can be the electron beam machining cell with open and closed construction.The electron-beam cell that is fit to is included as web based application and the low voltage unit that designs." low pressure " is meant the unit of output voltage at 0-500kV.The example that is applicable to the electron beam machining cell in apparatus of the present invention includes but not limited to, the PCT Engineered Systems of Iowa Davenport, unit in the BROADBEAM series of the industrial electronic beam processing machine that LLC produces, the Energy Sciences of Massachusetts Wilmington, Inc. the unit in the ELECTROCURTAIN series of the industrial electronic beam processing machine of Chaning, the unit in the AEB series of modules of the industrial electronic beam processing machine that the Advanced Electron Beams of Massachusetts Wilmington produces.
The electron beam machining cell can be operated between the about 500kV of about 50-, especially between the about 300kV of about 100-, or in about 150kV operation.The electron beam machining cell can send the about 30MRads of about 2-to elastic layer, the electron beam irradiation of the about 15MRads of particularly about 5-or about 10MRads.
Fig. 1-9 has shown the device of making the elastic laminate material that comprises the crosslinked elastic layer that is formed by crosslinkable elastocopolymer.Especially, Fig. 1-6 has shown the device that is used to make vertical filament laminate (VFL), Fig. 7 has shown the device of the laminated material (CFSBL) that is used to make the continuous monofilament stretch-bonded, and Fig. 8 and Fig. 9 have shown the device of the laminated material (VFL/CFSBL) of the vertical filament-continuous monofilament stretch-bonded that is used to make mixing.Although accompanying drawing has shown VFL, the apparatus and method of CFSBL and VFL/CFSBL are to be understood that other the apparatus and method consistent with the present invention's spirit also can be used.
Referring to Fig. 1, mould 12 is extruded the layer 14 of crosslinkable elastocopolymer such as elastic phenylethylene based block copolymer.Elastic layer 14 can present the form of multi-filament band or parallel filaments.Crosslinkable elastic layer 14 is supplied with first roller 16, and under the stretching situation, transmit by the space 32 of 34 on first roller 16 and second roller.Elastic layer 14 is transmitted in the machining cell 26 and by processing region 36 and forms crosslinked elastic layer 38.Elastic layer 14 can and be sent to lamination nip 22 by one or more pressure rollers (fly roller) 40 and ground roll (grounding roll) 42 through machining cell 26.Ground roll 42 is fit to be positioned near the processing region 36, with the elastic layer 14 in support and the maintenance processing region 36, and influences the crosslinked of styrene block copolymer.
In the VFL process, the distance between roller 16,34 and the lamination nip 22 is regulated through careful, and is minimum thereby the linear distance that elastomeric monofilaments is passed at point-to-point transmission reaches.Along with the increase of distance between roller and the lamination nip, the motion of the elastomeric monofilaments more difficult control that becomes.Because the monofilament that is clamminess adheres to one easily when contacting with other monofilament, so monofilament control is an important consideration.In order to control the motion that is transported to the monofilament in lamination nip 22 processes from roller 16,34, the vacuum conveyor (not shown) can be set between second roller 34 and machining cell 26 control and/or guide elastic layer 14 to enter the motion of machining cell 26.In another embodiment, the vacuum conveyor (not shown) can be positioned at machining cell 26.Other monofilament control method includes but not limited to antivacuum conveyer, and the monofilament transfer roller of groove is arranged, the monofilament tension force of raising and/or to the improvement of entrapped air control, and they can be used for elastic layer 14 is sent to lamination nip 22 from second roller 34.
Referring to Fig. 2, can place between machining cell 26 and the lamination nip 22 to control the motion of crosslinked elastic layer 30 at point-to-point transmission between the folder of the control between roller 56 and the roller 58 54.
Machining cell 26 can have the structure of sealing, comprises the shielding fence 48 (shown in the profile) that surrounds processing region 36.When machining cell 26 during for the electron beam of sealing or e-bundle machining cell, shielding fence 48 is preferably in generation spuious (stray) radiation closed area in.As shown in Figure 1, the electron beam machining cell 26 of sealing comprises that vacuum chamber 50 and high voltage source 52 are used to produce electron beam irradiation.Although Fig. 1 has described the electron beam machining cell of sealing, but also can use any other suitable radiation source that uses to cause the machining cell that is fit to that styrene block copolymer is crosslinked, these radiation sources include but not limited to γ radiation and ultraviolet (UV) radiation.
Perhaps, shown in Fig. 3 and 4, machining cell 26 can be electron beam or the e-bundle machining cell with comprising of open architecture of arc radiation shield 64.The outer surface setting of machining cell 26 best close second or lower end roller 34 makes processing region 36 between the radiation shield 64 and second roller 34.This second roller 34 plays the effect of electron collection device, and also absorbs the radiation that is produced by electron beam.This second roller 34 preferably includes adhesion and/or the release of plasma release coat with control elastic layer 14 pair rollers 34.This structure has improved the monofilament quenching intensity of standard, and does not need extra headroom that machining cell 26 is installed between second roller 34 and the lamination nip 22.As shown in Figure 4, second machining cell 68 can be positioned near first or outer surface 70 places of upper end roller 16.
As shown in Figure 5, second or lower end roller 34 can be removed, and the electron beam machining cell of machining cell 26 as sealing is placed between roller 16 and the lamination nip 22.This structure has special advantage when the needs headroom.
The cross-linked styrene based block copolymer can obtain the advantage on some efficient before reaching room temperature.Be control and/or adjusting elastic layer 14 crosslinked preceding temperature, machining cell 26 can comprise a quench systems (not shown).The quench systems that is fit to can comprise the monofilament temperature before integral air (integral air) or surface contact monofilament quench systems come meticulous adjusting generation crosslinked.
Refer again to Fig. 1, for example unwound roller in feed source 18 is sent nonwoven web 20 between laminating roll 44 and laminating roll 46 lamination nip 22.Elastic laminate material 30 is by with 38 combinations of crosslinked elastic layer, bonds or is laminated on the nonwoven web 20 and forms.Crosslinked elastic layer 38 and nonwoven web 20 can adopt various heat treatments, and adhesion process and ultrasonic processing and other are fit to the processing method of various application and combine.Also can use contact adhesive.As shown in Figure 2, bonding mould 60 can be set on nonwoven web 20 adhesive is provided, as the adhesive of the fusion of heat.
As shown in Figure 2, can transmit 62 combinations of second nonwoven web, bond or be laminated on the crosslinked elastic layer 38 to lamination nip 22.
Elastic laminate material 30 can be sent to reel 30 from lamination nip 22, and laminated material stores and use in the future to collect.Perhaps, elastic laminate material 30 also can be sent to other device (not shown), for example in personal care product's machine, is used for being incorporated into the intermediate product of finishing product or finishing product.
Referring to Fig. 6, showed the VFL device that is used to make the elastic laminate material 30 that contains crosslinked elastic layer, wherein machining cell 26 is between lamination nip 22 and reel 72.The laminated material 74 and the elastic layer 14 that contain nonwoven web 20 and 62 are transmitted through machining cell 26, to carry out the crosslinked of elastocopolymer and to form elastic laminate material 30.In this embodiment, the performance of laminated material can wait the amount of contraction that reaches to customize before crosslinked by laminated material 74.This customization can produce the form-to-fit fabric that predetermined amounts produces stress relaxation, and this is only using single source of polymer but not uses the setting that can obtain various performances under the multiple polymers.Embodiment shown in Fig. 6 also can use some crosslinked or crosslinkable adhesive that the durability of improvement can be provided as elastic laminate material 30.The elastic laminate material that contains cross-linked binder can be used for making the durability fabric, and these fabrics can be stood and clean, and higher temperature and/or repeated use in the drying but still keep low lamination cost.
The dose of radiation that puts on laminated material 74 need carefully be controlled.Under higher dosage, e-bundle or electron beam treatment may be destroyed the polypropylene nonwoven surface layer, but under the crosslinked level of control, the e-bundle is handled extra benefit can be provided.When in nonwoven web 20 and 62 one of or both in when containing polypropylene, the dose of radiation that puts on laminated material 74 can arrive about 20MRads at most, is preferably the about 10MRads of about 2-, or the about 8MRads of about 4-.Comprise polyethylene, as the ethylene-alpha-olefin copolymer elastomer of the single-site catalyzed that discloses above, as hemicrystalline polyolefin elastomer and the propylene-ethylene elastomer that discloses above, and/or the non-woven lining of styrenic block copolymer elastomer can be used for replacing polypropylene.
Referring to Fig. 7, the device 80 that is used to make the laminated material 82 of continuous monofilament stretch-bonded comprises mould 84, is used for the crosslinkable elastocopolymer 86 of one deck is expressed into the feed surface 88 that fibre web forms device 90.Mould 84 preferably includes the filament die that is used to extrude a plurality of parallel filaments.Fibre web forms device 90 and transmits the elastic layer of extruding 86 94 times at the meltblown die that is positioned on the feed surface 88.The elastomeric fibre 96 of these meltblown die 94 ejection random arrangement, it covers and forms composite elastic layer 98 on the elastic layer 86.This composite elastic layer 98 is transmitted into machining cell 92, and wherein elastocopolymer is cross-linked to form crosslinked elastic layer 100.This crosslinked elastic layer 100 is sent to lamination nip 102.Feed source 104 provides at least one nonwoven web 106 to be sent to lamination nip 102, nonwoven web combination here, and boning or being laminated to forms elastic laminate material 82 on the crosslinked elastic layer 100.
Fig. 8 and Fig. 9 have showed the device of the laminated material that is used to make vertical filament-continuous monofilament stretch-bonded.Device comprises mould 112, and its one deck that will contain crosslinkable elastocopolymer 116 is expressed on the roller 116.Mould 112 is preferably the filament die of extruding many parallel filaments.Crosslinkable layer 114 is transmitted through machining cell 118 and forms crosslinked elastic layer 120.Crosslinked elastic layer 122 forms device 122 by fibre web and transmits for 124 times at meltblown die.The elastomeric fibre of these meltblown die 124 ejection random arrangement covers and forms composite elastic layer 126 on the elastic layer 120.This composite elastic layer 126 can be sent to the lamination nip (not shown), here it can in conjunction with, bond or be laminated at least one the nonwoven web.
As shown in Figure 8, machining cell 118 can be positioned at outer surface 128 places near roller 116.Machining cell 118 preferably has open structure and/or can be open electron beam machining cell.In this embodiment, crosslinkable elastic layer 114 can be quenched when crosslinked.
As shown in Figure 9, machining cell 118 can form between the device 122 at roller 116 and fibre web.Machining cell 118 preferably has the structure of sealing and/or can be the electron beam machining cell of sealing.In this embodiment, crosslinkable elastic layer 114 can partly be quenched before it enters machining cell 118.
Fig. 1 and 2 has schematically described the method for the vertical filament laminate 30 that is used to make the elastic layer that comprises crosslinkable elastocopolymer monofilament.This method comprises: a mould 12 is provided, to be expressed on first roller 16 by the layer 14 that polymerisable elastic phenylethylene based block copolymer forms, with the elastic layer extruded 14 by transmitting with stretched vertically elastic layer 14 between the slit 32 of 34 on first roller 16 and second roller, the elastic layer 14 that will be in the stretching tense situation transmits by machining cell 26, the cross-linking elasticity copolymer forms crosslinked elastic layer 38 by the processing region 36 that is positioned at machining cell 26 by making elastic layer 14, the crosslinked elastic layer 38 that will be in the stretching tense situation transmits by lamination nip 22, at least one nonwoven web 20 is provided and passes through crosslinked elastic layer 38 and nonwoven web 20 are formed elastic laminate material 30 by lamination nip 22.
As shown in Figure 2, this method can further comprise transmits by control folder 54 the crosslinked elastic layer 38 that is in the stretching tense situation, coating adhesive on nonwoven web 20, second nonwoven web 62 is provided, coating adhesive on second nonwoven web 62, and making nonwoven web 20, the crosslinked elastic layer 38 and second nonwoven web 62 that are in the stretching tense situation form elastic laminate material 30 by lamination nip 22.
Fig. 6 has schematically described the method that is used to make the vertical filament laminate 30 that comprises the elastic layer that is formed by crosslinkable elastocopolymer.This method comprises: the polymerisable elastocopolymer monofilament 14 of one deck is expressed on first roller 16, with the elastic layer extruded 14 by between the slit (roll gap) 32 of 34 on first roller 16 and second roller to form the elastic layer 14 of stretched vertically, the elastic layer 14 that will be in the stretching of stretching tense situation is sent to lamination nip 22, first nonwoven web 20 is provided, coating adhesive on first nonwoven web 20, second nonwoven web 62 is provided, make first nonwoven web 20, the crosslinked elastic layer 14 that stretches, form laminated material 74 with second nonwoven web 62 by lamination nip 22, lax laminated material 74, laminated material 74 is transmitted through machining cell 26, and make laminated material 74 form VFL 30 by the processing region 36 cross-linking elasticity polymer that are positioned at machining cell 26.
Fig. 7 has schematically described the method for the laminated material 82 that is used to make the continuous monofilament stretch-bonded that comprises crosslinked elastic layer.This method comprises: one deck is comprised that polymerisable elastocopolymer 86 is expressed into fibre web and forms on the device 90, the elastomer meltblown fibers of ejection random arrangement covers and forms composite elastic layer 98 on the elastic layer of extruding 86, composite elastic layer 98 is transmitted by machining cell 92, form crosslinked elastic layer 100 through the cross-linking elasticity copolymer, this crosslinked elastic layer 100 stretches, the crosslinked elastic layer 100 that will be in the stretching tense situation is sent to lamination nip 102, at least one nonwoven web 106 is provided, makes crosslinked elastic layer 100 and at least one nonwoven web 106 form CFSBL 82 by lamination nip 102.
Fig. 8 and Fig. 9 have schematically described the method for the laminated material (VFL/CFSBL) of the vertical filament-continuous monofilament stretch-bonded that is used to make the mixing that comprises crosslinked elastic layer.This method comprises: a polymerisable elastocopolymer layer 14 is expressed on the roller 16, the layer of extruding 14 is passed through machining cell 118, the cross-linking elasticity copolymer forms crosslinked elastic layer 120, crosslinked elastic layer 120 is sent to fiber to be formed on the device, the elastomer meltblown fibers of ejection random arrangement covers and forms composite elastic layer 126 on the crosslinked elastic layer 120, the composite elastic layer 126 that will be in the stretching tense situation is sent to lamination nip, composite elastic layer 126 is laminated at least one the nonwoven web forms VFL/CFSBL.
Elastic laminate material can be used for including but not limited to clothing in the various disposables, infection control product and personal care product defined above.In these were used, elastic laminate material showed as high performance elastomeric material, and the hysteresis that has is less than 25, more preferably less than 20%, or less than 15%.
Here the embodiments of the present invention of Jie Luing are exemplary, can make various changes and improvements not breaking away under the spirit and scope of the invention.Scope of the present invention is limited by accompanying Claim, has comprised the implication that falls into its equivalent and all changes within the scope in the claim.

Claims (20)

1. device of making elastic laminate material, comprising: a mould is used to extrude the layer that contains crosslinkable elastocopolymer; At least one roller is used to transmit the elastic layer of extruding; One feed source is used to provide at least one nonwoven web; One lamination nip is used at least one nonwoven web is laminated to the elastic layer of extruding; At least one machining cell is used for the cross-linking elasticity copolymer; And reel, be used to collect elastic laminate material.
2. the device of claim 1, wherein mould comprises the filament die that is used to extrude many parallel crosslinkable elastocopolymer monofilament.
3. the device of claim 1, wherein mould comprises the silk ribbon mould of the element that is used to extrude the parallel crosslinkable elastic ribbon shape of multiply.
4. each device among the claim 1-3, wherein at least one machining cell is between at least one roller and lamination nip.
5. each device among the claim 1-3, wherein at least one machining cell is positioned at after the lamination nip.
6. each device among the claim 1-3 comprises upper end roller and the lower end roller transmits the elastic layer of extruding.
7. the device of claim 6 comprises first machining cell that is positioned near lower end roller outer surface.
8. the device of claim 7 comprises second machining cell that is positioned near the upper end roller outer surface.
9. the device of claim 8, wherein first and second machining cells are positioned at the opposition side of device.
10. each device among the claim 1-9 further comprises the meltblown die that places on the fibre web formation device, is used to spray the elastomer of random arrangement to cover the elastic layer of extruding.
11. the device of claim 10, wherein at least one machining cell forms between device and the lamination nip at fibre web.
12. the device of claim 10 further comprises the roller between filament die and fibre web formation device.
13. the device of claim 12, wherein at least one machining cell is positioned near the roller outer surface.
14. each device among the claim 1-13, wherein machining cell comprises the electron beam machining cell.
15. each device among the claim 1-14, wherein the electron beam machining cell is operated under the about 300kV of about 100-, to the radiation of the about 30MRads of the elastic layer about 2-of output.
16. each device among the claim 1-15, further comprise vacuum conveyor control the basis the motion of elastic layer between at least one roller and lamination nip.
17. the device of claim 16, wherein vacuum conveyor is between machining cell.
18. each device among the claim 1-17, wherein machining cell contains the temperature that quench systems is regulated the elastic layer before crosslinked.
19. each device among the claim 1-18, wherein crosslinkable elastocopolymer comprises the elastic phenylethylene based block copolymer.
20. each device among the claim 1-19, wherein crosslinkable elastocopolymer comprises the elastic polyolefin copolymer, and it is selected from hemicrystalline polyolefin plastomers and propylene-ethylene copolymers.
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US7384491B2 (en) 2008-06-10
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BRPI0614273A2 (en) 2011-03-22
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